CN219895131U - Compression seat support and seat unit - Google Patents

Abstract

The utility model provides a compression seat support and a seat unit, wherein the compression seat support comprises a first linkage assembly and a first fixing plate; the first linkage assembly comprises a first seat frame, a first connecting rod, a second connecting rod and a third connecting rod, wherein: the first seat frame is movably connected to the first fixed plate through at least two first connecting rods, one end of each first connecting rod is pivotally connected to the first seat frame, and the other end of each first connecting rod is pivotally connected to the first fixed plate; a second link pivotally connected to the first leg assembly, the second link pivotally connected to the first link nearest the first backrest assembly; the first end of the third link is pivotally connected to the first leg assembly and the second end of the third link is pivotally connected to the first backrest assembly. The utility model can compress the size of the seat unit as much as possible in the longitudinal direction, thereby realizing the effect of reducing the volume and the weight of the seat unit on the premise of realizing the posture adjustment of the seat unit, being convenient for packaging and transportation and effectively reducing the cost.

Description

Compression seat support and seat unit

Technical Field

The utility model relates to the technical field of seat supports, in particular to a compression seat support and a seat unit.

Background

The functional seat is popular because the functional seat can be used for posture adjustment, and the use requirements of different postures of users are met. The conventional functional seat realizes posture adjustment through the structure of the seat support and the driving part, the seat support generally comprises legs and a backrest part, the legs and the backrest part are linked through a linkage part, and the driving part applies acting force to at least one of the three parts to realize posture adjustment and transformation. In the conventional design, in order to realize posture adjustment, the structure of the linkage part is complex, so that the overall size of the assembled seat support in the longitudinal direction is larger, the seat support is inconvenient to package and transport, meanwhile, the volume of a seat unit assembled by using the seat support, such as a functional seat, is large, the used production materials are increased to a certain extent, and the production cost is increased.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide a compression seat bracket which has simple structure, small longitudinal dimension and convenient package and transportation.

Another object of the present utility model is to provide a seating unit that uses the aforementioned compression seat frame, which is inexpensive to produce.

The embodiment of the utility model is realized by the following technical scheme:

a seat unit comprising a first fixed plate, a first leg assembly, a first linkage assembly and a first backrest assembly, wherein the first leg assembly, the first linkage assembly and the first backrest assembly are sequentially pivoted, and the first linkage assembly is adjustably assembled to the first fixed plate; the first linkage assembly comprises a first seat frame, a first connecting rod, a second connecting rod and a third connecting rod, wherein: the first seat frame is movably connected to the first fixed plate through at least two first connecting rods, one end of each first connecting rod is pivotally connected to the first seat frame, and the other end of each first connecting rod is pivotally connected to the first fixed plate; the second link is pivotally connected to a first leg assembly, the second link is pivotally connected to the first link nearest the first backrest assembly; the first end of the third link is pivotally connected to the first leg assembly and the second end of the third link is pivotally connected to the first backrest assembly.

The first linkage assembly is simple in structure, and the size of the seat unit can be compressed as much as possible in the longitudinal direction, so that the effect of reducing the volume and the weight of the seat unit is further achieved on the premise of achieving posture adjustment of the seat unit, and the compressed seat support is convenient to package and transport, and can effectively reduce production and transportation costs.

According to a preferred embodiment, the number of first links is two.

According to a preferred embodiment, the first leg assembly includes a drive link and a second support link pivotally connected to the first linkage assembly, and further includes a first extension link, a second extension link, and a first foot rest; one end of the first extending connecting rod is pivoted to the first foot rest, the other end of the first extending connecting rod is pivoted to the free end of the second supporting connecting rod, and the pivot point of the first extending connecting rod and the second supporting connecting rod is a first pivot point; one end of the second extending connecting rod is pivoted to the first foot rest, a pivot joint between the second extending connecting rod and the first foot rest is a second pivot joint, and the other end of the second extending connecting rod is pivoted to the free end of the driving connecting rod; the second extension connecting rod is pivoted with the second support connecting rod, and a pivot point between the second extension connecting rod and the second support connecting rod is a third pivot point; when the driving connecting rod rotates around the pivot point of the driving connecting rod and the first linkage assembly, a rod section, which is positioned between the second pivot point and the first pivot point, of the first extending connecting rod is defined as a main rod section, and when the driving connecting rod is observed from the outer side of the second extending connecting rod along the axial direction of the rotating shaft of the driving connecting rod towards the first extending connecting rod, the upper edge of the main rod section can be shielded by the second extending connecting rod.

According to a preferred embodiment, the second support link is pivotally connected to the first seat frame; the driving connecting rod is pivotally connected to the second connecting rod, and a pivot point between the driving connecting rod and the second connecting rod is a fourth pivot point; the pivot point between the driving connecting rod and the second extending connecting rod is a fifth pivot point, the driving connecting rod is pivotally connected to the first seat frame, the pivot point between the driving connecting rod and the second extending connecting rod is a sixth pivot point, and the sixth pivot point is positioned between the fifth pivot point and the fourth pivot point; the first end of the third connecting rod is pivotally connected to the driving connecting rod, and a pivot point between the first end and the second end is a seventh pivot point, and the seventh pivot point is located between the sixth pivot point and the fifth pivot point.

According to a preferred embodiment, the first seat frame includes a seat frame body and a second extension plate, and the second extension plate is disposed on the seat frame body; the drive link is pivotally connected to the second extension plate with a pivot point therebetween being the sixth pivot point.

According to a preferred embodiment, the first backrest assembly comprises a first backrest support plate, the second end of the third link is pivotally connected to the first backrest support plate, and the pivot point between the second end and the third link is an eighth pivot point; the first backrest support plate is pivotally connected to the first seat frame, a pivot joint between the first backrest support plate and the first seat frame is a ninth pivot joint, and the eighth pivot joint is not overlapped with the ninth pivot joint.

According to a preferred embodiment, the first seat frame includes a seat frame body and a third extension plate, and the third extension plate is disposed on the seat frame body; the first backrest support plate is pivotally connected to the third extension plate, and a pivot point between the first backrest support plate and the third extension plate is the ninth pivot point.

According to a preferred embodiment, the first link closest to the first backrest assembly is defined as a rear bar on which a first extension plate is provided; the second link is pivotally connected to the rear lever through the first extension plate; the second connecting rod is pivotally connected with the first extension plate.

According to a preferred embodiment, the connection point of the first extension plate with the rear lever is between the pivot points of the rear lever with the first seat frame and the first fixing plate, respectively.

According to a preferred embodiment, a pivot point between the first connecting rod and the first seat frame is defined as a moving point, a pivot point between the first connecting rod and the first fixed plate is defined as a static point, and a connecting line between the moving point and the static point on the same first connecting rod is a moving line segment; the length of orthographic projection of the moving line segments of the two first connecting rods on the first fixed plate is equal or unequal.

According to a preferred embodiment, defining the top surface of the first seat frame as a mounting surface, and the direction perpendicular to the mounting surface is a first direction; the maximum distance between the first fixing plate and the mounting surface in the first direction is 100mm-200mm.

The compression seat bracket comprises a first fixed plate, a first leg assembly, a first linkage assembly and a first backrest assembly, wherein the first leg assembly, the first linkage assembly and the first backrest assembly are sequentially pivoted, and the first linkage assembly is adjustably assembled to the first fixed plate; the compression seat bracket is configured to be switchable between a storage posture and an extended posture under the action of a driving member; when the compression seat bracket is switched from the storage posture to the extension posture, the first leg assembly extends forward in front of the first linkage assembly, and at the same time, the first backrest assembly tilts backward; when the compression seat support is switched from the stretching posture to the storage posture, the first leg assembly is reset and folded at the lower side of the first linkage assembly, and meanwhile, the first backrest assembly is reset and inclined forwards.

A seating unit comprising the compression seat support described above. The seat unit has small volume, small occupied space and low production cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic front view of a compressed seat support in an extended position in a seat unit according to an embodiment of the present utility model;

fig. 2 is a schematic front view of a compressed seat support in a seat unit according to an embodiment of the present utility model;

fig. 3 is a schematic perspective view of a compressed seat support in an extended position in a seat unit according to an embodiment of the present utility model;

FIG. 4 is a first elevational structural view of a compression seat bracket according to an embodiment of the present utility model in an extended position;

fig. 5 is a second front view schematically illustrating a compressed seat support in an extended position according to an embodiment of the present utility model.

Icon: 100-mount, 200-compression seat bracket, 210-first leg assembly, 211-second extension link, 212-first extension link, 213-first leg rest, 214-second support link, 215-drive link, 220-first linkage assembly, 221-first seat frame, 2211-seat frame body, 2212-third extension plate, 2213-second extension plate, 2214-mount face, 222-first link, 223-second link, 224-third link, 231-first back support plate, 240-first pivot point, 241-second pivot point, 242-third pivot point, 243-fourth pivot point, 244-fifth pivot point, 245-sixth pivot point, 246-seventh pivot point, 247-eighth pivot point, 248-ninth pivot point, 249-tenth pivot point, 250-first fixed plate, 260-first shaft, 270-second shaft, 280-first electric push rod, 290-first extension plate, a-second pivot point, b-line segment, c-line segment.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Referring to fig. 1 to 5, a compression seat bracket includes a first fixing plate 250, a first leg assembly 210, a first linkage assembly 220 and a first backrest assembly, wherein the first leg assembly 210, the first linkage assembly 220 and the first backrest assembly are sequentially pivoted, the first linkage assembly 220 is adjustably assembled to the first fixing plate 250, and the first fixing plate 250 is fixedly mounted to the lifting seat 106; first leg assembly 210 includes a drive link 215 and a second support link 214 pivotally connected to first linkage assembly 220, and further includes a first extension link 212, a second extension link 211, and a first foot rest 213; one end of the first extension link 212 is pivoted to the first foot rest 213, the other end of the first extension link 212 is pivoted to the free end of the second support link 214, and the pivot point between the first extension link 212 and the second support link 214 is the first pivot point 240; one end of the second extension link 211 is pivoted to the first foot rest 213, the pivot point between the two is a second pivot point 241, and the other end of the second extension link 211 is pivoted to the free end of the driving link 215; the second extension link 211 and the second support link 214 are pivoted, and the pivot point between the second extension link 211 and the second support link 214 is a third pivot point 242; when the driving link 215 rotates around its pivot point with the first linkage assembly 220, a rod section of the first extension link 212 between the second pivot point 241 and the first pivot point 240 is defined as a main rod section, and an upper edge of the main rod section can be blocked by the second extension link 211 when viewed from the outside of the second extension link 211 along the rotation axis of the driving link 215 toward the first extension link 212.

As shown in fig. 3, in the present embodiment, two compression seat brackets 200 are assembled on the mount 100 in a mirror image manner from side to side, constituting a seat unit, and the two compression seat brackets 200 are linked. Specifically, the first leg assembly 210, the first linkage assembly 220, and the first backrest assembly are configured to be capable of being linked by the first electric push rod 280 to switch the compression seat bracket 200 between a stowed position and an extended position, wherein the first leg assembly 210 is below the first linkage assembly 220 when the compression seat bracket 200 is in the stowed position.

Specifically, as shown in fig. 1 to 3, the two compression seat brackets 200 are respectively linked by a first shaft 260 and a second shaft 270, wherein an end of the first shaft 260 is fixed to the second support link 214, an end of the second shaft 270 is fixed to the first fixing plate 250, and one end of the first electric push rod 280 is pivotally connected to the first shaft 260 and the other end is pivotally connected to the second shaft 270. More specifically, the compression seat bracket 200 is configured to be switchable between a storage posture and an extended posture by the first electric push rod 280; when the compression seat bracket 200 is switched from the storage posture to the extended posture, the first leg assembly 210 is extended forward in front of the first link assembly 220, and at the same time, the first backrest assembly is tilted backward; when the compression seat frame 200 is switched from the extended position to the retracted position, the first leg assembly 210 is retracted back to the lower side of the first linkage assembly 220, and at the same time, the first backrest assembly is retracted forward to tilt.

For ease of description, as shown in fig. 4 and 5, there is a single compression seat bracket 200. As shown in fig. 1 and 4, the pivot point of first extension link 212 and first foot rest 213 is tenth pivot point 249; the second pivot point 241 is not overlapped with the tenth pivot point 249. The tenth pivot point 249 and the second pivot point 241 are not overlapped, so that the first foot rest 213, the first extension connecting rod 212, the second extension connecting rod 211 and the second support connecting rod 214 can form a four-bar mechanism, and the first foot rest 213 can be inclined relative to the ground in the storage posture, so that the height between the stored functional sofa and the ground is increased, and a sufficient gap is reserved between the functional sofa and the ground, thereby being beneficial to sanitary cleaning. In use, the first leg assembly 210 is used to support the user's lower leg or foot, enabling the user to achieve a comfortable recumbent position, effectively relieving lower limb fatigue. Specifically, in the four-bar mechanism composed of the first footrest 213, the first extension link 212, the second extension link 211, and the second support link 214, the first extension link 212 is spatially distributed on the obliquely lower side of the second extension link 211. In the conventional four-bar mechanism, however, a gap between the upper edge of the first extension link 212 and the lower edge of the second extension link 211 can cause a pinching injury to the user. In this embodiment, the second extension link 211 shields the first extension link 212, so that the first extension link 212 and the second extension link 211 can be prevented from being pinched by a user due to a narrow gap generated by posture adjustment, and safety is high. The first footrest 213 here is for mounting a footrest for supporting the lower limbs of a user.

Further, the first linkage assembly 220 includes a first seat frame 221, a first link 222, a second link 223, and a third link 224, wherein: the first seat frame 221 is movably connected to the first fixing plate 250 through at least two first connecting rods 222, one ends of the first connecting rods 222 are pivotally connected to the first seat frame 221, and the other ends of the first connecting rods 222 are pivotally connected to the first fixing plate 250; the second support link 214 is pivotally connected to the first seat frame 221; the driving link 215 is pivotally connected to the second link 223, the pivot point between the driving link 215 and the second extending link 211 is a fourth pivot point 243, the pivot point between the driving link 215 and the second extending link 211 is a fifth pivot point 244, the driving link 215 is pivotally connected to the first seat frame 221, the pivot point between the driving link 215 and the second extending link is a sixth pivot point 245, and the sixth pivot point 245 is located between the fifth pivot point 244 and the fourth pivot point 243; the second link 223 is pivotally connected to the first link 222 nearest the first back assembly; the first end of the third link 224 is pivotally connected to the drive link 215 with a seventh pivot point 246 therebetween, the second end of the third link 224 is pivotally connected to the first backrest assembly, and the seventh pivot point 246 is between the sixth pivot point 245 and the fifth pivot point 244.

In this embodiment, as shown in fig. 4, the first frame 221 includes a frame main body 2211 and a second extension plate 2213, and the second extension plate 2213 is disposed on the frame main body 2211; the drive link 215 is pivotally connected to the second extension plate 2213 with a sixth pivot point 245 therebetween. Preferably, the second extension plate 2213 is welded to the seat frame body 2211, and is used for extending the size of the seat frame body 2211 towards the lower side, so as to reduce the material consumption of the seat frame body 2211 and save the production cost on the premise of not affecting the use of the seat frame body 2211.

In this embodiment, the first backrest assembly includes a first backrest support 231, the second end of the third link 224 is pivotally connected to the first backrest support 231, and the pivot point between the second end and the third link is an eighth pivot point 247; the first backrest support 231 is pivotally connected to the first seat frame 221, and the pivot point between the first backrest support and the first seat frame is a ninth pivot point 248, where the eighth pivot point 247 is not coincident with the ninth pivot point 248. Further, the first frame 221 further includes a third extension plate 2212, and the third extension plate 2212 is disposed on the frame body 2211; the first backrest support 231 is pivotally connected to the third extension plate 2212, and the pivot point therebetween is a ninth pivot point 248. As shown in fig. 2, the third extension plate 2212 is welded to the seat frame body 2211, and is used for extending the size of the seat frame body 2211 towards the upper side, so as to reduce the material consumption of the seat frame body 2211 without affecting the use of the seat frame body 2211, and save the production cost.

As shown in fig. 3 and 4, in this embodiment, the first link 222 closest to the first backrest module is defined as a rear rod, and the rear rod is welded with the first extension plate 290; the second link 223 is pivotally connected to the rear lever by the first extension plate 290; the second link 223 is pivotally connected to the first extension plate 290. The connection point of the first extension plate 290 and the rear lever is between the pivot points of the rear lever and the first seat frame 221 and the first fixing plate 250, respectively.

In the present embodiment, the number of the first links 222 is two. Here, the two first links 222, the first seat frame 221, and the first fixing plate 250 constitute a planar four-bar mechanism, so that the first linkage assembly 220 is highly stable during posture adjustment. Further, a pivot point between the first link 222 and the first seat frame 221 is defined as a moving point a, a pivot point between the first link 222 and the first fixing plate 250 is defined as a stationary point b, and a line between the moving point a and the stationary point b on the same first link 222 is defined as a line segment c; the length of the orthographic projection of the line segment c of the two first links 222 on the first fixing plate 250 is equal or unequal. Preferably, the length of the orthographic projection of the line segment c of the first link 222 on the first fixing plate 250 is not equal, and the length of the orthographic projection of the line segment c of the first link 222 on the side close to the first backrest module on the first fixing plate 250 is greater than the length of the orthographic projection of the line segment c of the first link 222 on the side close to the first leg module 210 on the first fixing plate 250.

As shown in fig. 2 and 5, the top surface of the first seat frame 221 is defined as a mounting surface 2214, and the direction perpendicular to the mounting surface 2214 is a first direction; the maximum distance between the first fixing plate 250 and the mounting surface 2214 in the first direction is 100mm to 200mm. In the present embodiment, when the compression seat holder 200 is in the storage posture, 110 mm.ltoreq.d1.ltoreq.200mm; preferably, d1=160 mm; when the compression seat support 200 is in the extended posture, D2 is 100mm or less and 190mm or less; preferably d2=150 mm. In this embodiment, the first linkage assembly 220 has a simple structure, and can compress the size of the seat unit as much as possible in the longitudinal direction, so that the effect of reducing the volume and the weight of the seat unit is further achieved on the premise of achieving the posture adjustment of the seat unit, and the compressed seat support 200 is convenient for packaging and transportation, so that the production and transportation costs can be effectively reduced. It should be noted that, the seat unit provided in this embodiment is only one of the assembly application scenarios of the compressed seat support 200 provided in this embodiment, and is not limited to the assembly application scenario. In other embodiments, the maximum distance between the first securing plate 250 and the mounting surface 2214 in the first direction is 120mm-180mm.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (13)

1. A compression seat bracket comprising a first fixed plate (250), a first leg assembly (210), a first linkage assembly (220), and a first backrest assembly, wherein,

the first leg assembly (210), the first linkage assembly (220) and the first backrest assembly are sequentially pivoted, and the first linkage assembly (220) is adjustably assembled to the first fixed plate (250);

the first linkage assembly (220) includes a first seat frame (221), a first link (222), a second link (223), and a third link (224), wherein:

the first seat frame (221) is movably connected to the first fixed plate (250) through at least two first connecting rods (222), one end of each first connecting rod (222) is pivotally connected to the first seat frame (221), and the other end of each first connecting rod is pivotally connected to the first fixed plate (250);

the second link (223) being pivotally connected to a first leg assembly (210), the second link (223) being pivotally connected to the first link (222) closest to the first backrest assembly;

a first end of the third link (224) is pivotally connected to the first leg assembly (210), and a second end of the third link (224) is pivotally connected to the first backrest assembly.

2. The compression seat bracket according to claim 1, wherein the number of first links (222) is two.

3. The compression seat bracket according to claim 1, wherein the first leg assembly (210) comprises a drive link (215) and a second support link (214) pivotally connected to a first linkage assembly (220), further comprising a first extension link (212), a second extension link (211), and a first foot rest (213);

one end of the first extension connecting rod (212) is pivoted to the first foot rest (213), the other end of the first extension connecting rod (212) is pivoted to the free end of the second support connecting rod (214), and the pivot point of the first extension connecting rod (212) and the second support connecting rod (214) is a first pivot point (240);

one end of the second extension connecting rod (211) is pivoted to the first foot rest (213), a pivot point between the second extension connecting rod and the first foot rest is a second pivot point (241), and the other end of the second extension connecting rod (211) is pivoted to the free end of the driving connecting rod (215);

the second extension connecting rod (211) is pivoted with the second support connecting rod (214), and a pivot point between the second extension connecting rod and the second support connecting rod is a third pivot point (242);

when the driving connecting rod (215) rotates around a pivot point of the driving connecting rod and the first linkage assembly (220), a rod section, which is positioned between the second pivot point (241) and the first pivot point (240), of the first extending connecting rod (212) is defined as a main rod section, and when the driving connecting rod is observed from the outer side of the second extending connecting rod (211) along the axial direction of a rotating shaft of the driving connecting rod (215) towards the first extending connecting rod (212), the upper edge of the main rod section can be shielded by the second extending connecting rod (211).

4. The compression seat support of claim 3 wherein,

the second support link (214) is pivotally connected to the first seat frame (221);

the drive link (215) is pivotally connected to the second link (223) with a fourth pivot point (243) therebetween;

the pivot point between the driving connecting rod (215) and the second extending connecting rod (211) is a fifth pivot point (244), the driving connecting rod (215) is pivotally connected to the first seat frame (221), the pivot point between the driving connecting rod and the second extending connecting rod is a sixth pivot point (245), and the sixth pivot point (245) is located between the fifth pivot point (244) and a fourth pivot point (243);

the first end of the third link (224) is pivotally connected to the driving link (215), and the pivot point between the first end and the second end is a seventh pivot point (246), and the seventh pivot point (246) is located between the sixth pivot point (245) and the fifth pivot point (244).

5. The compression seat bracket according to claim 4, wherein the first frame (221) includes a frame body (2211) and a second extension plate (2213), the second extension plate (2213) being provided to the frame body (2211);

the drive link (215) is pivotally connected to the second extension plate (2213) with a pivot point therebetween being the sixth pivot point (245).

6. The compression seat bracket of claim 1, wherein the first back assembly includes a first back support plate (231), the second end of the third link (224) being pivotally connected to the first back support plate (231), the pivot point therebetween being an eighth pivot point (247); the first backrest support plate (231) is pivotally connected to the first seat frame (221), a pivot point between the first backrest support plate and the first seat frame is a ninth pivot point (248), and the eighth pivot point (247) is not overlapped with the ninth pivot point (248).

7. The compression seat bracket according to claim 6, wherein the first frame (221) includes a frame body (2211) and a third extension plate (2212), the third extension plate (2212) being provided to the frame body (2211);

the first backrest support plate (231) is pivotally connected to the third extension plate (2212), and the pivot point between the first backrest support plate and the third extension plate is the ninth pivot point (248).

8. The compression seat bracket according to claim 1, wherein the first link (222) defined closest to the first backrest assembly is a rear bar on which a first extension plate (290) is provided;

the second link (223) is pivotally connected to the rear bar by the first extension plate (290);

the second link (223) is pivotally connected to the first extension plate (290).

9. The compression seat bracket according to claim 8, wherein the connection point of the first extension plate (290) and the rear lever is between the pivot point of the rear lever and the first seat frame (221) and the pivot point of the first fixing plate (250), respectively.

10. The compression seat bracket according to claim 2, characterized in that a pivot point between the first link (222) and the first seat frame (221) is defined as a moving point (a), a pivot point between the first link (222) and the first fixed plate (250) is a stationary point (b), and a connecting line between the moving point (a) and the stationary point (b) on the same first link (222) is a line segment (c);

the length of orthographic projection of the line segment (c) of the two first connecting rods (222) on the first fixing plate (250) is equal or unequal.

11. The compression seat bracket according to claim 1, wherein a top surface defining the first seat frame (221) is a mounting surface (2214), and a direction perpendicular to the mounting surface (2214) is a first direction;

the first fixed plate (250) has a maximum distance between the first direction and the mounting surface (2214) of 100mm-200mm.

12. A compression seat bracket comprising a first fixed plate (250), a first leg assembly (210), a first linkage assembly (220), and a first backrest assembly, wherein,

the first leg assembly (210), the first linkage assembly (220) and the first backrest assembly are sequentially pivoted, and the first linkage assembly (220) is adjustably assembled to the first fixed plate (250);

the compression seat bracket is configured to be switchable between a storage posture and an extended posture under the action of a driving member;

when the compression seat bracket is switched from the storage posture to the extension posture, the first leg assembly (210) extends forward in front of the first linkage assembly (220), and at the same time, the first backrest assembly tilts backward; when the compression seat bracket is switched from the stretching posture to the storage posture, the first leg assembly (210) is restored and folded to the lower side of the first linkage assembly (220), and at the same time, the first backrest assembly is restored and tilted forwards.

13. A seating unit comprising a compression seat support (200) according to any one of claims 1 to 12.